Rudolph kxhler



(No Model.) 2 Sheets-Sheet` 1.

' R. KHLER.

RBVOLVING ROASTER.

10.475,060. Patented May 17, 189g.

A TTOHNE YS (No Model.) 2 Sheets-Sheet 2'.

- R KHLER RBVOLVING ROASTBR.

Nd. 475,060. Patented May 17,1892.`

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OMM v To a/ZZ whom t may concern:

UNrTnD STATES PATENT OFFICE.

RUDOLPH KHLER, OF LIPINE, GERMANY.

REVOLVING ROASTER.

SPECIFICATION forming part of Letters Patent No. 475,060, dated May 17, 1892.

Application filed January 6, 1891. Serial No. 376.892. (No model.)

Beit known that I, RUDOLPH KHLER, fo u ndry-owner, a subject of the Emperor of Germany, residing at Lipine, Silesia, in said Empire, have invented a certain new and useful Improvement in Revolving Roasters, of which I delare the following to be a full, clear, and exact description.

This invention relates to a revolvingr assayfuruace for the drying, caloination, or roasting of pulverized material in general and for the roasting of sulphide of zinc in particular.

In the accompanying drawings, Figure I shows a longitudinal section through the furnace and its front part K and back part L; Fig. II, a section on line a; n of Fig. I; Fig. III, the front view of part L; Fig. IV, the front view of part K; Fig. V. a section following line l l of Fig. I; Fig. VI, a section following line 2 2 of Fig. I; Fig. VILa top view of the front part K, with a section through the fire-brick C, Fig. II, as also a part of a rotating-retort with heating of the air for the roasting of sulphide of zinc. i

The principal parts of .this retort. are, first, the rotating cylinder F; second, the front door K, and, third, the rear door L. The lastnamed two parts are on movable trucks W YV', (on the tracks S S,) and are movable, as well sidewise from the oven as also to the front, by means of the hand-screws II II and rollers R R, so that aspace is formedbetween the furnace proper and these doors, which construction can be used for cleaning purposes.

The retort F consists of an inner easilychanged {ire-brick cylinder Y in the form of a Inuffie, with-the dividing-walls c e. yThis cylinder is surrounded with fire-brick, Fig. VI, in which the heating-canals f and aircanals g are arranged. Exteriorly the furnace is inclosed byan iron casing a with stiffening-rings b b, and these latter rest on rollers c c. (See Figs. I and Il.) The whole cylinder F is given slow rotatory movement by means of a driving-gear CZ.

The retort is closed by the front furnacedoor K and the rear one L. They have the purpose of effecting the continuous connection of the lower and upper gas and air canals with the corresponding chambers in K and L. Tight joints between these doors and the cylinders are made by pressing them against the cylinder by means of the hand-screws H I-I. They therefore remain stationary while the furnace rotates. If theinner furnace is to be repaired, the doors K and L are screwed back and rolled to the side on the tracks S.

The process of roasting is as follows: From any desired fuel the heating -gases pass through the heating-canal h into the lower heating-gas chamber il, and from here they flow in the direction shown by the arrows through the openings 72y into the lower heating-canal f, through the openings Zinto the rear heating-gas chamber m,.through the openings n into the upper heating-canalsf, and flow then through openings ointo the uppercollecting chamber p and the due q to the chimney. rlhe combustion air, which is furnished under la slight pressure by an air compresser or ventilator, goes through the pipe r into the upper air-collecting chambers, flows through the openings t into the upper aircanals g, through the openingsu into the rear air-collecting chamber fu, through openings w into the lower air-canals g, and goes in a heated condition through the openings @cinto the lower air-collecting chamber y and pipez into the furnace-cylinder F. The crude sul phide is fed through the opening o from the hopper h into the last chamber, goes from one chamber intothe other throughthe overfall openings a, and is iinally discharged in a perfect roasted condition through the discharge-opening d onto a loading-board e', running transversely to the direction of the furnace. During lthe process of roasting the cylinder F rotates and the roasting material is carried through the screw-like-arranged passages from the receiving-place to the discharge-opening. The gases generated during the roasting go through the openings dof the dividing-walls e from one chamber into the other, and finally flow in an enriched condition through pipe b to the dust-chamber to be further treated.

The roaster is a retort in which the roasting IOO ' chamber of the front part K.

nace into several chambers the enriched gasesA which are in the rear chambers are hindered from Aflowing back.

Through the induction under slight pressure of the air through the tube r into the upper chamber s, Figs. I and 1I, and from here through canals g (in the direction of the arrows) thewalls of the furnace are cooled off, and the air is then heated by the heatingcanals f. The course of theroastingcan also be regulated, according to whether more or less pressure is given.

In Fig. Il two fire-bricks C C are shown. These are as broad as the open breadth of the (See, also, Fig.

VII, wherethis fire-brick is shown in section.) These stones C C separate the upper and the lower air and heating chambers.

No special value is laid on the feeding of the roasting material through hopper h and pipe o, which is eected by a mechanicallyactuated worm nor on the discharge through d.

I claim- In a revolving roaster, the combination of a hollow rotating cylinder having longitudinal air and gas passages in its walls, doors K and L, closing the ends of said cylinder, door K being provided with air inlet andv exhaust chambers p z', arranged to communicate with the air-passages in the cylinder, and gas inlet and exhaust chambers arranged to commu nicate with the gas-passages in the cylinder, door L, provided with passages arranged to connect'the air and gas' passages, respectively, means for conveying the heated air from the exhaust-chamber 1I to the interior of the cylinder, and an escape-flue leading from the cylinder, substantially as set forth. y

In testimony whereof I have signed this specification in the presence of two subscrib- .in g witnesses.

RUDOLPH KHLER.

Vitnesses:

M. DUNLAP, NELLIE B. DUNLAP. 

